Abstract
This article describes the retrovirus expression with optimal nutrient supply and its potential growth inhibition effects in continuous hybridoma cell cultivation. A special reactor setup with total cell retention was developed to examine growth inhibition effects. Using this fermentation strategy we observed a decrease of viability cell rate which occurred at a defined state of the process despite sufficient nutrient supply. Therefore we assume that inhibitory substances are responsible for these effects. The molecular weight range of the inhibitory substances and the possible retrovirus cooperation of these growth inhibition effects were examined. To determine the molecular weight range we used the following methods: ultrafiltration, gelfiltration, ultracentrifugation and gel electrophoresis. Furthermore, RT-PCR and western-/immunoblot are used to detect retrovirus particles in the supernatant and to show a retrovirus participation on growth inhibition effects. The possible growth modulation was tested in a biological assay (MTT-assay).
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